JPS61238567A - Steering wheel - Google Patents

Abstract

PURPOSE:To prevent a pad from rattling due to backlashes and gaps, by urging planetary gears toward the centers of sun gears. CONSTITUTION:When a steering control is carried out, planetary gears 31, 32 on the column side and the pad side rotate their axes and revolve respectively around sun gears on the column side and the pad side in association with the rotation of a boss plate 6. Meanwhile, an urging section 27 is resiliently deformed in the diametrically outward direction of the associated sun gear in its attached condition, and therefore, urges a bearing member 24 and a planetary member 33 inward of an attaching recess 20. Accordingly, the sun gears 31, 32 are urged toward the center of the sun gears.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a steering wheel equipped with a planetary gear mechanism for preventing pads from rotating.

(Problems to be Solved by the Prior Art and the Invention) The non-rotating pad type steering wheel includes ■Klaxon horn, constant speed running device, communication device, radio, switches for headlights 1 to 1, etc., and sound generator in the pad portion. Developed with the objectives of attaching electronic devices such as displays and improving the operability of the electronic devices by taking advantage of non-rotating pads, and increasing product value by giving a sense of luxury. It is progressing.

One of the butt non-rotating mechanisms is a planetary gear mechanism, but in the case of this mechanism, backlash inevitably exists between the planetary gear and the sun gear, as well as dimensional errors, assembly errors, etc. This inevitably creates large gaps. These bumps and gaps are a major problem because they cause the pad to rattle and generate abnormal noises, detracting from the sense of luxury that was one of the objectives of the product's development.

Among the conventionally known planetary gear mechanisms that are connected to the steering wheel, there is a type that takes this backlash into consideration, such as a type that is used in combination with a planetary roller as seen in Utility Model Application No. 57-191654. = There are problems with lability and durability.

The present invention solves the conventional problem that the bat rattles or abnormal noise occurs due to the gap between the gears, which spoils the sense of luxury. The purpose of the present invention is to provide a steering wheel that can suppress slippage in the circumferential direction with gears and maintain the bat's non-rotation even when an external force is applied to the bat.

Structure of the Invention (Means for Solving the Problems) The present invention is characterized in that a bearing part that supports a planetary gear is attached to a boss plate by a biasing part made of a leaf spring, and the The above-mentioned problem was solved by a technical means of biasing the planetary gear toward the center of the sun gear by deforming the sun gear radially outward in advance.

(Function) Since the fishing part (a) forces the planetary gear toward the center of the sun gear, it suppresses backlash between the gears and also reduces gaps between gears caused by thermal expansion, one-dimensional error, assembly error, etc. It also makes me lose my mind. Therefore, rattling of the covering pad due to backlash and gaps does not occur, and abnormal noise is also reduced.

Further, when a rotational force is applied to the pad from the outside, the planetary gear tries to overcome the tooth height of the sun gear and displace in the radial outward direction of the sun gear. However, since the diagonal portion made of the leaf spring is elastically deformed in advance in the radially outward direction of the sun gear, it is difficult to deform any further in the same direction. Therefore, a phenomenon in which the planetary gear and the sun gear become disengaged and the planetary gear slips in the circumferential direction of the sun gear is unlikely to occur, and non-rotation of the pad is maintained.

(First Embodiment) Next, a first embodiment in which the present invention is embodied in an automobile steering wheel will be described with reference to FIGS. 1 to 3.

The outer edge of the front end of the ram 1 of an automobile is provided with a protrusion 2 around the entire circumference to prevent dust and light from entering, and a steering shaft 3 passes through the ram 1.

A boss 4 is tightened and fixed to the front end of the steering shaft 3 by a nut 5, and is fixed to the boss 4 by a boss plate, welding, or the like. Two spokes 7 are integrally formed on the lower edge of the boss plate 6 and extend in a V-shape.
A ring portion 8 is supported on the tip shaft of the spoke portion 7.

A ram-side sun gear 9 made of synthetic resin is attached to the ram-side outer circumference of the boss 4 so as to be rotatable relative to the boss 4 via a bearing 10, and is rotatable relative to the ram 1 by a bolt 11. It is fixed so that it does not occur. Similarly, a pad-side sun gear 12 made of synthetic resin is attached to the outer periphery of the boss on the pad side via a bearing 13 so as to be rotatable relative to the boss 4. Both sun gears 9 and 12 are formed to have the same diameter and the same number of teeth.

A box-shaped pad 15 is attached to the front end surface of the pad-side sun gear 12 with bolts 16, and the pad 15 includes switches for a horn, a constant speed traveling device, a communication device, a radio, a headlight 1, etc. Electronic devices 17 such as a sound generator and a display are attached. A protrusion 18 is provided on the outer edge of the rear end of the pad 15 to prevent dust and light from entering, and is opposed to the protrusion 2 of the ram 1 at a small distance of 8'3. There is. Note that an optical transmitter (not shown) connected to the electronic device 17 is attached to the pad 15 and the column.

A rectangular groove (=I recess 20) which is open on the outside and extends to the center of the boss plate 6 is cut out at one location on the outer periphery of the boss plate 6 (the upper part in this embodiment). A punch hole 21 is provided on both sides of the mounting recess 20 of No. 6.

A bearing member 2/1 made of synthetic resin such as polyacetal is disposed in the mounting recess 20. The bearing member 2/1 is formed by integrally molding three support plates 25 into a frame shape, and a holding groove 26 is formed inside each support plate 25 to function as a slip bearing.

Further, on both sides of the bearing member 2/4, a plate spring curved outwardly convex is constructed and covered (= I force part 27 is integrally formed of synthetic resin, and roughly has a takeaway hole 28 at its tip. Mounting part 2
9 is integrally formed. The bearing member 24 is attached to the boss spray 1-0 by inserting the two screws 22 into the take-in holes 28 of the biasing part 27 and then screwing them into the screw holes 21 of the boss sprays 1-6. ing.

Bearing part (J 2 /l) Each retaining groove 26 has an M star shaft 1.
Both ends and the center of the shafts 1 to 30 are rotatably supported, and a column-side planetary gear 3 is provided near both ends of the shafts 1 to 30 (=J).
1 and Para 1 to the road star gear 32 are fixedly attached and housed between the support plate 25. Ryodo star gear 31.321,1
: They are made of synthetic resin and have the same diameter and the same number of teeth, and mesh with the column side sun gear 9 and the pad side sun gear 12, respectively. Therefore, the two-way star gears 31 and 32 revolve around the respective sun gears 9 and 12 while simultaneously and similarly rotating. Hereinafter, for convenience of explanation, the planetary shaft 30 and the two-way planetary gears 31 and 32 will be collectively referred to as the planetary member 33.

Here, the above-mentioned fishing part 27 will be explained in detail in relation to the gear.

■Before attaching the sea urchin biasing part 27 to the boss plate 6 shown in FIG.
The biasing portion 27 is formed in a large curve so as to be approximately 0.3 to 10 m narrower than the spacing between the two.

■Next, when attaching to the boss plate 6 shown in FIG.
, 12, its curvature is extended.

(2) After this contact, the biasing portion 27 is elastically deformed in the radial outward direction of the sun gear 9° 12 until the spacing between the mounting holes 28 matches the spacing between the screw holes 21, allowing the screw 22 to be screwed into the biasing portion 27.

That is, since the biasing portion 27 is elastically deformed in the radially outward direction of the sun gears 9 and 12 in the attached state shown in FIG.
is biased inward. Therefore, each of the planetary gears 31 and 32 is biased toward the center of the sun gears 9 and 120 (in the meshing direction) by the biasing portion 27, and gaps due to backlash and errors between the gears are suppressed.

Further, since the biasing portion 27 has been deformed in advance in the radial outward direction of the sun gears 9 and 12, it is difficult to deform any further in the same direction.

The 1-J force section 271jl is provided exclusively for the purpose of suppressing the backlash and gap and suppressing the slip of gears, which will be described later.

Next, the functions and effects of the first embodiment configured as described above will be explained.

Now, when the ring portion 8 is rotated to perform a steering operation, as the boss plate 6 is rotated, the planetary gears 31 and 32 on the ram side and the pad side are respectively = 1. The sun gear 9 on the ram side and the pad side is , 12. Here, since the column side sun gear is unrotatable with respect to the ram 1, the pad side sun gear 12 is always in a non-rotatable state with respect to the ram 1, following the column side sun gear 9. becomes.

In addition, when operating the steering wheel, the A" fishing section 27
is the planetary gear 31. due to the elastic force based on the elastic deformation.
32 is pressed toward the center of the sun gears 9 and 12 to suppress bumps between the gears, and also eliminate gaps between the gears due to thermal expansion, dimensional errors, deviation errors, etc. Therefore, the pad 15 does not rattle as in the conventional case, and abnormal noise is also reduced.

Further, when a driver or the like applies a rotational force to the pad 15 from the outside forcibly or accidentally, the planetary gears 31 and 32 tend to be displaced in the radially outward direction of the sun gears 9 and 12. but,
As mentioned above, the biasing portion 27 is moved from the state shown in FIG. 3 to the sun gear 9,
Since it is difficult to deform any further in the radially outward direction of the bearing member 12, the bearing member 24 is also difficult to be displaced any further in the same direction. Therefore,
The biasing portion 27 prevents the planetary gears 31, 32 from being displaced beyond the tooth height of the sun gears 9, 12, etc. In other words, the meshing of both gears is disengaged and the planetary gears 31 and 32 become the sun gear 9.
, 120 The phenomenon of slipping in the circumferential direction is unlikely to occur,
The non-rotation of the pad 15 is maintained.

Further, in this embodiment, since the bearing member 24 and the biasing portion 27 are integrally formed of synthetic resin, the number of parts does not increase and assembly is easy.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. This embodiment differs from the first embodiment only in the structure of the bearing member.

That is, the bearing member 35 of this embodiment consists of a single support plate 36 made of synthetic resin, and a holding groove 37 that functions as a helical bearing is formed inside the support plate 36 .

Further, on both sides of the bearing member 35, biasing portions 27 and the like similar to those in the first embodiment are integrally formed of synthetic resin. In this embodiment as well, the biasing portion 27 is extended from the curved state shown in FIG. 4 to the state shown in FIG. has been done.

The center portion of a planetary shaft 30 is rotatably supported in the holding groove 37 of the bearing member 35, and a column-side M star gear 31 and a pad-side planetary gear 32 are fixed to both ends of the shaft 300, respectively.

Therefore, in addition to the same effects as the first embodiment, this embodiment also contributes to reducing the space factor, loss, etc. because the structure of the bearing member 35 is simple. However, the first embodiment is superior in terms of the rigidity of the bearing member and the backlash of the bearing.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment differs from the second embodiment only in that the biasing section 40 is attached to the outer surface of the bearing member 35.

In this embodiment as well, the biasing portion 40 is attached to the boss plate 6 after being elastically deformed in the radially outward direction of the sun gears 9 and 12.

Therefore, this embodiment also has the same effects as the first embodiment.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG. It differs from the example.

Therefore, this embodiment also has the same effects as the first embodiment.

Note that this invention is not limited to the configurations of each of the embodiments described above, and can be embodied as desired without departing from the spirit of the invention.

Effects of the Invention As detailed above, the present invention can suppress backlash and gaps between gears in a planetary gear mechanism, prevent rattling of pads, and also reduce abnormal noise. This has the excellent effect of suppressing the phenomenon in which the planetary gear disengages and slips in the circumferential direction of the sun gear when rotational force is applied to the pad from the outside, thereby maintaining pad non-rotation. play.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of a steering wheel embodying the present invention seen from the side, FIG. 2 is an exploded perspective view showing the main parts before assembly, and FIG. 3 is the same main parts. FIG. 4 is a perspective view showing the main parts of the second embodiment in the pre-assembled state; FIG. 5 is a perspective view showing the main parts in the assembled state; FIG. The figure is a front view showing the main parts of the third embodiment, and FIG. 7 is the front view showing the main parts of the fourth embodiment. 6...Boss plate, 9...Column side sun gear, 1
2... Pad side sun gear, 15... Pad, 24...
...Bearing member, 27...Biasing part, 31...Column side planetary gear, 32...Pad side planetary gear, 35...Bearing member, 40°41...Biasing part. Patent applicant: Toyoda Gosei Co., Ltd. Agent
Patent Attorney On 1) Hironobu Q Toshitake Hoto 1 Aji no Taste

Claims (1)

[Claims] 1. A steering wheel equipped with a planetary gear mechanism with a boss plate in between to prevent the pad from rotating,
Bearing members (24, 3) that pivotally support the planetary gears (31, 32)
5) is attached to the boss plate (6) by a biasing part (27, 40, 41) made of a leaf spring, and the biasing part (27, 40, 41) is attached to the radius of the sun gear (9, 12). The planetary gear (
31, 32) are biased toward the center of the sun gear (9, 12). 2. The steering wheel according to claim 1, wherein the bearing members (24, 35) and the biasing portions (27) extending on both sides thereof are integrally formed of synthetic resin. 3. Two planetary gears (31, 32) are fixed near both ends of the planetary shaft (30), and the bearing member (24) supports both ends and the center of the planetary shaft (30). A steering wheel according to claim 2, characterized in that: 4. Two planetary gears (31, 32) are fixed to both ends of the planetary shaft (30), and the bearing member (35) pivotally supports only the center portion of the planetary shaft (30). A steering wheel according to claim 2. 5. The bearing member (35) is made of synthetic resin, and the urging parts (40, 41) attached to the bearing member (35) are made of a metal plate. steering wheel.